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Online since: February 2012
Authors: Joost R. Duflou, Hans Vanhove, Albert van Bael, Amar Kumar Behera, Amirahmad Mohammadi
Several factors can affect the geometrical accuracy, such as the thickness of the blank, lubrication, tool diameter, and geometry of the part.
Temperature dependent material properties play an important role for laser transformation hardening.
For this study these properties were selected based on data derived from reference [7].
This confirms that the observed underforming is dependent on material properties as well as on the part geometry.
[5] R.W., Honeycombe, H.K., Bahadeshia, Steels: Microstructure and Properties.(2nd ed.), Arnold, London, 1995, pp. 83–114
Online since: October 2014
Authors: Marin Guțu
Introduction The blades are one of the most expensive components of a wind turbine and their mass affects parameters and cost of the other components (hub, nacelle and tower).
Therefore, too large safety factors are applied in calculations of strength of the blade which leads to its weight increase.
Designed ply material properties necessary as input data in ANSYS Workbench Material parameters EX [GPa] EY [GPa] Ez [GPa] υxy υyz υxz Gxy [GPa] Gyz [GPa] Gxz [GPa] UTS-L* [MPa] UCS-L* [MPa] Thickness [mm] Lay-up Material UD600[0]2 40 15.9 15.9 0.29 0.29 0.29 4.7 3.5 4.7 629 -530 1 WR300[±45]4 15 15 8 0.3 0.3 0.3 4.7 2.7 2.7 144 -215 1 *UTS-L, UCS-L - Ultimate longitudinal tensile and compressive strength.
Mandell Mechanical Properties of Composite Materials for Wind Turbine Blades, Composite Material Fatigue Database, Version 22.0; June 25, (2013), Montana State University, available at http://www.coe.montana.edu/composites, accessed: 17.09.2013
Bere, Mechanical characteristics of composite materials obtained by different technologies, Academic Journal of Manufacturing Engineering. 4 (2011) 100-105
Online since: February 2014
Authors: Liu Tao Chen, Hua Wei Zhang, Y. Liu, Y.X. Li
Li1,2,d,* 1Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China 2Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China aclt07@mails.tsinghua.edu.cn, bhuawei.zhang@gmail.com, cyuanliu@tsinghua.edu.cn dyanxiang@tsinghua.edu.cn (Y.
temperature independent fluid properties, (6).
constant solid properties.
The experimental results and simulation results both show that porous copper heat sink has excellent heat transfer performance, which was deeply affected by area ratio of penetrating pores.
Besides, the structural parameters of porous copper are the important factors which influence the heat transfer performance of heat sink.
Online since: October 2008
Authors: Guy Daculsi, Eric Aguado, Eric Goyenvalle, Franck Jegoux, Ronan Cognet, Françoise Moreau
All the current CPCs are reported to have good mechanical properties and reasonable setting times.
All the current CPCs are reported to have good mechanical properties and reasonable setting times.
During membrane-promoted bone formation, membrane porosity has been found to be of importance for the initial rate of bone formation as well as for the performance of the material in the tissue, although the final amount of bone seems not to be affected [12].
Growth factors and bone regeneration.
Online since: July 2005
Authors: Miroslav Hnatko, Pavol Šajgalík, Zoltán Lenčéš, Jow Lay Huang, Miroslav Balog, Jozef Keckes, J. Janega, R. Horváthová
The difference in cationic field strength of individual rare-earth might result in different grain boundary phase properties and microstructure development [4,5].
The present work deals with the investigation of nano-mechanical properties (nano-hardness, modulus) and macro-hardness of SiC and Si3N4/SiC composites.
The samples were hot pressed at 1850 °C/1h (SiC) or at 1750 °C/2h (Si3N4) under mechanical pressure of 30 MPa in Ar+N2 (SiC) or N2 (Si3N4) atmosphere, respectively.
It was already published that the measured nano-hardness is only partially affected by grain boundary chemistry [9].
The reason for lower macro-hardness is the influence of several factors like triple pockets, porosity, grain size, indentation size effect, etc., but mainly the grain boundary phase composition in polycrystalline materials.
Online since: October 2010
Authors: Claudio Modena, Alessio Pipinato, Carlo Pellegrino
In the aftermath of a damaging earthquake, many of these systems play a critical role for the emergency response community and the community in general to save lives and prevent additional damage to property (Schiff and Buckle 1995).
In particular from the structural point of view, damage could influence the dynamic response of a structure and, at the same time, changes in its behavior may be associated with the decay of the system's mechanical properties (Salawu 1997).
With regard to fatigue assessment of riveted historical metal bridges, many factors have found to play an important role, as documented by several studies (DiBattista, et al. 1997, Matar and Greiner 2006, Pipinato et al. 2009a, Pipinato et al. 2009b) and an accurate estimation of the stress variation by means of a detailed experimental approach or proper numerical analyses of the critical details is of key importance for a reliable estimation of the remaining fatigue life of the structure.
No alternative model has been realized computing for material degradation , e.g., reducing transversal section, as the visual inspection performed has considered this problem not affecting the structure.
The application of an assessment procedure to the Adige Bridge outlined some relevant issues: - the materials used in this quite old railway bridge have shown mechanical and chemical properties (strength, chemical composition) comparable to those provided by actual Eurocodes; - corrosion is a local phenomenon that does not necessarily play a relevant role on the global response of the bridge if section loss is less than 15%; - fatigue cracks, not discovered in this first phase assessment; - fatigue assessment concerning the remaining life could be performed using the Palmgren - Miner rule, accounting the possible traffic increase for the estimation of the residual lifetime: the result gives a reasonable and detailed estimation of safe exercise; - monitoring should be an option when the "calculated" fatigue safety is insufficient.
Online since: June 2010
Authors: Marek Szkodo
Szkodo Gdansk University of Technology, Faculty of Mechanical Engineering, ul.
This work presents investigations of cavitation properties of different austenitic microstructures formed by laser beam machining of X5CrNi18-10 and C45 steels.
The microstructure of eroded material is a key factor in the control of its cavitation resistance.
sample C45 alloyed surface layer heat affected substrate Fig. 2.
Cavitation properties of laser-processed materials were calculated on the surface of 4 mm2.
Online since: August 2012
Authors: Adam Niesłony, Michał Böhm
The paper deals with a comparison of fatigue life calculations, obtained on the basis of classical Basquin diagrams and approximated diagrams acquired with the use of the section method, which allows us to fit the diagrams shape to real material properties.
Introduction Mechanical fatigue of the material is a process resulting from a time varying load and manifested by the loss of cohesion of the material and its ability to carry loads.
This is the simplest practical case in which the particular role is played by the quality of the fit to the actual characteristics of the fatigue properties of the material.
Observations and conclusions The application of experimental fatigue diagrams approximated with the section method in the process of fatigue determination affected the accuracy of the calculated results.
Factor of safety and working stress.
Online since: March 2012
Authors: A.R. Azrin Hani, A. Roslan, J. Mariatti, M. Maziah
Ballistic Materials In designing soft body armors, high strength and high modulus fabrics are most essential properties [1,3,6].
Table 1 display the mechanical properties of most common ballistic grade materials [2,4-7].
Table 1: Mechanical properties of typical ballistic fibres.
This affects the frictional interaction between the yarns and thereby improves the ballistic properties.
However, it is important to notice the factors concerning with armor product design and development.
Online since: August 2013
Authors: Zhao Wen Tang, Quan Zhong Liu, Lang Gao
Soil nailing is a practical and proven technique used in retaining excavations and stabilizing slopes by reinforcing the ground in situ with relatively small, closely spaced, fully bonded inclusions, usually steel bars, which can improve native soil’s mechanical characteristics and create a uniform composite mass where soil are locked together.
Several factors have contributed to the popularity of soil nailing.
However, It is very complicated to predict the horizontal displacement because it is affected by many factors and the relationships among the horizontal displacement and these factors are highly nonlinear.
Fig. 1 BP Network architecture As mentioned above, the horizontal displacement of soil nailing is influenced by many factors such as soil properties, depth of excavation, nail spacing, nail length, and so on, which can be analyzed by using finite element method.
However, these factors will not be concerned in this paper.
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